Sink



FIG. 1 is a top, rear and left side perspective view showing my new design for a sink;

FIG. 2 is a top, rear and right side perspective view of the sink of FIG. 1;

FIG. 3 is a top, front and right side perspective view of the sink of FIG. 1;

FIG. 4 is a top, front and right side perspective view of the sink of FIG. 1;

FIG. 5 is a top plan view of the sink of FIG. 1;

FIG. 6 is a front view of the sink of FIG. 1, the rear view being a mirror image thereof; and,

FIG. 7 is a side view of the sink of FIG. 1, the opposite side view being a mirror image thereof.

The broken lines showing portions of the sink are included for the purpose of illustrating environment and form no part of the claimed design. 

The ornamental design for a sink, as shown and described. 